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Finding the Fourth Proportional to 102.01, 152.61 and 81.76

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Solution

The fourth proportional to 102.01, 152.61 and 81.76 is: 122.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.01 : 152.61 = 81.76 : x
  2. Step 2: Convert to fraction form
    102.01/152.61 = 81.76/x
  3. Step 3: Cross multiply
    102.01x = 152.61 × 81.76
  4. Step 4: Simplify right side
    102.01x = 12,477.39
  5. Step 5: Solve for x
    x = 12,477.39/102.01
  6. Step 6: Final answer
    x = 122.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.